Drive Pinion

1. Press drive front and rear bearing outer races into gear carrier using tool Nos. MB990934, MB990936 and MB990938, or equivalents.
2. Adjust drive pinion height as follows:
a. Install tool No. MB990819, or equivalent, and the drive pinion bearings into gear carrier. Apply a thin coat of grease to washer on tool.
b. Gradually tighten nut on tool until drive pinion preload is 3.5-4.3 inch lbs.

Fig. 13 Drive Pinion Height Measurement:

c. Position cylinder of tool No. MB990552, or equivalent, in side bearing seat of gear carrier, Fig. 13.
d. Using a feeler gauge, measure clearance between the two tools, then select drive pinion rear adjusting shim(s) corresponding to this measurement.
e. Install shim(s) between pinion and rear bearing, then press rear bearing onto pinion.
f. If the gear set is being replaced, install new shims of the same thickness as those previously used on the drive pinion. In determining thickness of shim pack to be used, the amount of compression of the shim pack and wear of the bearing, if the old bearing is reused, should be taken into consideration.
3. Adjust drive pinion preload as follows:
a. Install pinion preload adjusting shim between pinion spacer and front bearing. Torque end yoke to 138-180 ft. lbs. on rear differential or 116-159 ft. lbs. on front differential.
b. Measure drive pinion preload. Preload should measure 3.5-4.3 inch lbs. without oil seal installed.
c. Adjust preload as necessary by replacing adjusting shims or drive pinion spacers.
4. Remove end yoke, then apply a thin coat of grease to lip of oil seal.Drive seal into gear carrier using tool No. MB990031, or equivalent.
5. Apply grease to end yoke mating surface of seal, then install the end yoke. Torque attaching nut to 138-180 ft. lbs. on rear differential or 116-159 ft. lbs. on front differential.